Effects of exogenous strigolactone on the cadmium accumulation in Galinsoga parviflora Cav.

ABSTRACT

Strigolactone can improve the tolerance of plants to abiotic stress. To improve the phytoremediation capacity of cadmium (Cd) hyperaccumulator Galinsoga parviflora Cav., the effects of strigolactone (using strigolactone analog GR24 with the concentration of 1 and 2 μmol/L) on the Cd accumulation of G. parviflora were studied. Cd treatment at 0.1 mg/L inhibited the growth of G. parviflora. Under Cd stress (0.1 mg/L), GR24 had no significant effect on the biomass and catalase activity of G. parviflora, while it decreased the peroxidase activity and increased the superoxide dismutase activity. In addition, GR24 decreased the root Cd content and root Cd extraction. GR24 at 1 μmol/L increased the shoot Cd content, shoot Cd extraction, bioconcentration factor, and translocation factor, while at 2 μmol/L, the opposite effect was observed. When the concentration of GR24 was 1 μmol/L, the shoot Cd content and shoot Cd extraction increased by 8.75% and 12.35%, respectively, compared with control. Moreover, correlation and grey relational analyses showed that the translocation factor, shoot Cd content, and plant height were the top three most highly correlated parameters with the shoot Cd extraction. These findings suggest that GR24 at 1 μmol/L can improve the phytoremediation capacity of G. parviflora for Cd.

KEYWORDS:

• Hyperaccumulator
• strigolactone
• cadmium
• plant physiology

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Yuanxiang Yang

Yuanxiang Yang is an associate professor in Sichuan Agricultural University.

Qinfeng Zheng

Qinfeng Zheng is a postgraduate student of Sichuan Agricultural University.

Kexuan Zhou

Kexuan Zhou is an undergraduate student of Sichuan Agricultural University.

Yunying Xiao

Yunying Xiao is a postgraduate student of Sichuan Agricultural University.

Chengyi Huang

Chengyi Huang is an associate professor in Sichuan Agricultural University.

Rongping Hu

Rongping Hu is a research fellow in Sichuan Academy of Agricultural Sciences.

Lijin Lin

Lijin Lin is a professor in Sichuan Agricultural University.

Jin Wang

Jin Wang is an associate professor in Sichuan Agricultural University.